I bought a sewing machine a five years ago and I haven’t had to do any maintenance or repairs to it. What kinds of things are breaking on your machine?
I only use it a couple of times per year, and simply threading it is a genuine challenge for me. So is keeping a stich running. People who sew more or have good fine motor skill may just not remember the noob experience. I expect a lot of new renters to have a learning curve to climb.
it helps to have a good sewing machine - the difference between a poor quality one and e.g. a nice bernina is dramatic. even an old one thats been well maintained will give you many years of reliable use with minimal maintenance, and they're very affordable used